***ci:** add release-it, pre-commit and gitlab ci config ([b29b89b](https://gitlab.developers.cam.ac.uk/uis/devops/continuous-delivery/gitlab-triage/commit/b29b89b0ae03b1d99dd1be966f16c3439da09ff8))
***image:** add image that wraps the gitlab triage gem ([93044ce](https://gitlab.developers.cam.ac.uk/uis/devops/continuous-delivery/gitlab-triage/commit/93044ceea2dfdd5bafdaaa6d9ef27b43990d8c15))
***image:** install gitlab-triage gem from Gemfile ([99b4168](https://gitlab.developers.cam.ac.uk/uis/devops/continuous-delivery/gitlab-triage/commit/99b4168a7d5b06b4364dd77f18e79fa746ef9d87))